Question

How do you find the LCD between `4st, 10s`?

Answer 1

`LCD = 20st`

Explanation:

Write each expression as the product of the prime factors:

`" "4st = 2xx2" "xxsxxs`
`" "10st =ul(2" "xx 5 xxs)`
`" "LCD= 2xx2xx5xxsxxt = 20st`

the LCDmust be divisible by each expression and therefore must contain all the factors,but without any duplicates.

NOtice that `2xx2` is needed, otherwise `4` will not be a factor.